Starting problems with white smoke

My vehicle struggles with starting when cold, once started and running after 5 minutes all is fine and I can drive the car as normal and runs very well, no lack of power or hesitation.

No oil leaks, no oil leaks, no loss of coolant, can drive car all day, most forums say intake manifold butterly this has been checked and all is clean, no codes, glow plug relays been checked as well, had vehicle with the AA garage and they had overnight and thoroughly checked vehicle and found no issue. I'm thinking Crank Sensor, or boost pressure solenoid brown black canister with two vacum pipes, MAF sensor changed, , glow plug relay changed, glow plugs tested, fuel injectors checked as well. AA are now saying its firmware/software update. Any help would be appreciated.

Can the EVAP solenoid be connected wrong way round as in input output pipes.
The canister purge solenoid is the component in the EVAP system that is responsible for “purging” the EVAP system, by acting as the switch that allows the vapor into the engine. When the purge solenoid fails, it will cause problems for the EVAP system, which will affect the vehicle’s emissions output levels. Usually, a bad purge solenoid will display a few symptoms that can alert the driver that a potential problem has occurred and needs to be serviced.

Getting white smoke on start with pungent odour, once up and running all emmission smell goes away.

Desperate for help.